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		<title>Astronomy 101</title>
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		<li><a href="introduction.html">Introduction</a></li>
			<li><a href="#">Planets</a>
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				<li><a href="mercury.html" class="menu-link">Mercury</a></li>
                <li><a href="venus.html" class="menu-link">Venus</a></li>
				<li><a href="earth.html" class="menu-link">Earth</a></li>
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                <li><a href="jupiter.html" class="menu-link">Jupiter</a></li>
                <li><a href="saturn.html" class="menu-link">Saturn</a></li>
                <li><a href="uranus.html" class="menu-link">Uranus</a></li>
                <li><a href="neptune.html" class="menu-link">Neptune</a></li>
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		<li><a href="#">Comets</a>
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				<li><a href="comet-facts.html" class="menu-link">Comet Facts</a></li>
                 <li><a href="comet-period.html" class="menu-link">Comet Periods</a></li>
				 <li><a href="famous-comets.html" class="menu-link">Famous Comets</a></li>
                 <li><a href="comet-mission.html" class="menu-link">Comet Missions</a></li>
                 
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		<li><a href="#">Asteroids</a>
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                <li><a href="asteroid-facts.html" class="menu-link">Asteroid Facts </a></li>
				<li><a href="asteroid-mining.html" class="menu-link">Asteroid Mining </a></li>
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		<h2>References:</h2>
		
		<ol><li><a href= "http://en.wikipedia.org/wiki/CometC">Comet</li>
		<li><a href= "http://nasasearch.nasa.gov/search?utf8=%E2%9C%93&affiliate=nasa&query=asteroids">NASA Asteroids</li>
		<li><a href= "http://en.wikipedia.org/wiki/Orbit">Orbit</li> 
		<li><a href= "http://en.wikipedia.org/wiki/Asteroid">Asteroid</li> 
		<li><a href= "http://en.wikipedia.org/wiki/Asteroid#Characteristics">Asteroid Characteristics</li> 
		<li><a href= "http://en.wikipedia.org/wiki/Asteroid_mining">Asteroid Mining</li> 
		<li><a href= "http://www.esa.int/Our_Activities/Space_Science/Asteroids_Structure_and_composition_of_asteroids">Asteroid Structure and Composition</li>
		<li><a href= "http://www.space.com/14749-asteroids-composition.html">Asteroid Composition</li>
		<li><a href= "http://en.wikipedia.org/wiki/Interstellar_space">Interstellar Space</li> 
		<li><a href= "http://solarsystem.nasa.gov/planets/index.cfm">Solar system exploration</li> 
		<li><a href= "http://commons.wikimedia.org/wiki/">Wikimedia</li> 
		<li><a href= "http://news.nationalgeographic.com/news/2013/04/130410-asteroid-recovery-nasa-space-budget-science/">National Geographic - Asteroid Recovery</li>
		<li><a href= "http://en.wikipedia.org/wiki/Asteroid_mining">Asteroid Mining</li>
		<li><a href= "http://commons.wikimedia.org/wiki/File:Solar_power_satellite_from_an_asteroid.jpg">Solar Power Satellite image</li>
		<li><a href= "http://www.planetaryresources.com/asteroids/">Planetary Resources</li>
		<li><a href= "http://www.planetaryresources.com/asteroids/discovery-quantity/">Asteroid Discovery</li>
		<li><a href= "http://www.jpl.nasa.gov/news/news.php?release=2010-142">Jet Propulsion Laboratory</li>
		<li><a href= "http://www.space.com/15948-asteroid-belt-space-rocks-infographic.html">Space Rocks</li>
		<li><a href= "http://www.space.com/16105-asteroid-belt.html">Space.com</li>
		<li><a href= "http://www.space.com/15948-asteroid-belt-space-rocks-infographic.html">Asteroid Belt</li>
		<li><a href= "http://www.space.com/19878-halleys-comet.html">Halley's Comet</li>
		<li><a href= "http://www.newscientist.com/article/dn9975-top-10-comets.html#faq4">Top 10 Comets</li>
		<li><a href= "http://en.wikipedia.org/wiki/Champollion_(spacecraft)">Champollion</li>
		<li><a href= "http://en.wikipedia.org/wiki/Deep_Impact_(spacecraft)">Deep Impact Craft</li>
		<li><a href= "http://www.telegraph.co.uk/science/evolution/5422498/Meteorite-bombardment-may-have-made-Earth-more-habitable-said-study.html">Meteorite Bombardment</li>
		<li><a href= "http://en.wikipedia.org/wiki/Meteorite">Meteorites</li>
		<li><a href= "http://en.wikipedia.org/wiki/Comet_Hale%E2%80%93Bopp">Comet Hale-Bopp</li>
		<li><a href= "http://en.wikipedia.org/wiki/Comet_Hale%E2%80%93Bopp#Discovery">Comet Hale-Bopp</li>
		<li><a href= "http://nssdc.gsfc.nasa.gov/planetary/factsheet/cometfact.html">Comet Facts</li>
		<li><a href= "http://en.wikipedia.org/wiki/List_of_periodic_comets">Periodic Comets</li>
		<li><a href= "http://en.wikipedia.org/wiki/List_of_non-periodic_comets">Non-Periodic Comets</li>
		<li><a href= "http://en.wikipedia.org/wiki/Asteroid#Terminology">Asteroid Terminology</li>
		<li><a href= "http://en.wikipedia.org/wiki/List_of_missions_to_comets">Comet Missions</li>
		<li><a href= "http://www.nasa.gov/mission_pages/deepimpact/main/#.UoOeX3Bwohw">Deep Impact</li>
		<li><a href= "http://amazing-space.stsci.edu/resources/explorations/cometmyth/lesson/facts/Fact6/index_nf.html">Amazing Space</li>
		<li><a href= "http://www.nasa.gov/">NASA</a></li> 
		<li>- Gibbons, Gail. The Planets. Belmont, CA: Holiday House, 2008. Print.</li>
		<li>- Foxxe, Ellen. The Size, Composition, and Surface Features of the Planets Orbiting the Sun: An Anthology of Current Thought. Ed. Ellen Foxxe. New York: The Rosen Publishing Group, 2005. Print.</li>
		<li>- Nicolson, Cynthia Pratt. Discover the Planets. New York: Kids Can Press Ltd, 2005. Print.</li>
		<li><a href= "http://www.nasa.gov/">Nasa</a></li>
        <li>- Adamson, Thomas K. Venus. Mankato, Minn: Capstone Press, 2008. Print. Sexton, Colleen A. Venus. Minneapolis, MN: Bellwether Media, 2010. Internet resource.</li>
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